The working conditions of the dust collector of Bitumen mixing plant are very complicated, so the filter bags are faced with the test of high temperature and high concentration dust environment. If the asphalt mixing filter bag is not suitable, it will not only make the equipment unable to produce normally, but it will also cause great problems for users. Economic losses, now we introduce the selection of filter bags for the precipitator at Bitumen Mixing Plant.
The filter cloth must have suitable pores to allow the air to pass through and block fine dust from entering the interior of the filter cloth. Once the fine particles of dust enter the interior of the filter cloth, they cannot be removed, resulting in a significant decrease in the air permeability of the filter cloth, an increase in the dust removal resistance, and even the use of the filter bags. This is also the reason why the fiber diameter of the filter bag of the dust collector is required to be finer and the filter cloth is denser. Although the price of the filter cloth made of fine fiber is high, the filter resistance is large when it is first used, but it is relatively stable throughout the service life and has a long service life. Of course, there is now a new type of material that prevents dust from entering the interior of the filter cloth and does not lower its breathability, such as spraying or covering an ultra-thin fluorinated resin microporous film on the contact surface of the filter bag and the dust. The inert resin is completely hydrophobic, and the smooth surface will not only not adhere to dust, but also the dust that is produced by the adhesion will be greatly reduced for the dust with higher moisture content. It is also useful for special treatment of powder coating on the surface of the filter bag to form a very thin filter cake on the surface so that the porosity is relatively uniform and small. The same purpose can also be achieved by special processes such as calendering or sintering on the surface of the filter cloth. Three anti-oil (oil, water, anti-static) filter cloths are widely used in the dust removal industry of building materials companies. In short, when selecting dust bag materials, it is best to refer to relevant information or consult professional manufacturers and experts. Nowadays, there are many filter bag manufacturers, and the varieties vary greatly, and the price difference is also large. When selecting the filter bag, comprehensive consideration should be given to the price, service life, and physical properties of the processed material. Especially when the dust collector is purchased, it is not possible to simply consider the price, but must also consider its configuration and materials. Some filter bags are effective for handling certain dusts, but may not be optimal for other dusts. The filter cloth structure can be felted or woven. Most felt products absorb moisture due to the capillary action of the fibers, but some special felt products such as glass fiber knit felt can be moisture-proof to a certain extent. Felt products have irregular arrangement of fibers and uniform pores. At the same time, in order to ensure its strength, the thickness of the filter bag is relatively thick and the dust removal efficiency is high. In some important occasions or encountered dusty material, especially the filter bag with a higher surface air velocity is often used Felt fiber. Woven fabrics are woven from spinning. There are various patterns of pores in the spinning room, the surface is smooth, and it is easy to design a filter cloth that can keep or break away from the filter cake. In order to further improve the surface properties, silicone resin can be sprayed to obtain a wear-resistant surface, improve filter cake removal from the filter bag, or reduce the moisture absorption capacity of the filter bag. It is best to use woven fiber filter bags for various chemical products with low melting point and high adhesiveness. Meytas dust bag is the first choice for dust collectors in bitumen mixing plants.
The selection of the filter speed of the dust collector at the Bitumen Mixing Plant is also very knowledgeable because the impact on the life of the bag is too great.
The filter speed V of the bag filter is the ratio of the filtered gas flow rate (m3/min) to the filter fabric area (m2). The filter speed is an important parameter that determines the performance of the filter. The size of the filter directly affects the one-time investment, operation cost and dust removal efficiency of the bag filter. Too high a filtration rate can cause excessive pressure loss, reduce the efficiency of dust removal, and cause the filter bag to become clogged and quickly damaged. However, increasing the filtration rate can reduce the filtration area and treat the same flow of gas with smaller equipment. A small filtration rate will increase the dust removal efficiency and extend the service life of the filter bag, but it will cause the dust collector to be too large and increase one-time investment. At present, there are no available theoretical calculation formulas to calculate the filtration rate, which is mainly determined by experience. However, qualitatively speaking, it is related to the nature of dust, gas dust concentration, filter bag material and cleaning methods. Generally, if the dust concentration is high and the dust particles are small, the filtration speed should be taken as a small value and vice versa.
